28421499 has 4 divisors (see below), whose sum is σ = 37895336. Its totient is φ = 18947664.

The previous prime is 28421443. The next prime is 28421531. The reversal of 28421499 is 99412482.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28421499 - 2¹⁹ = 27897211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28421599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736914 + ... + 4736919.

It is an arithmetic number, because the mean of its divisors is an integer number (9473834).

Almost surely, 2^28421499 is an apocalyptic number.

28421499 is a deficient number, since it is larger than the sum of its proper divisors (9473837).

28421499 is an equidigital number, since it uses as much as digits as its factorization.

28421499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473836.

The product of its digits is 41472, while the sum is 39.

The square root of 28421499 is about 5331.1817639244. The cubic root of 28421499 is about 305.1750280884.

It can be divided in two parts, 28421 and 499, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28421499 in words is "twenty-eight million, four hundred twenty-one thousand, four hundred ninety-nine".